Opus 4.1 API Pricing
Opus 4.1 has tracked API rates of $15.00 per 1M input tokens and $75.00 per 1M output tokens. Cached input is billed at $1.50 per 1M tokens. Rates are in USD from the AI IQ dataset; see the Opus 4.1 model profile for capability scores.
Price List
| Rate | Price (USD) | Notes |
|---|---|---|
| Input | $15.00 | per 1M tokens |
| Output | $75.00 | per 1M tokens |
| Cached input (read) | $1.50 | per 1M tokens |
| Cache write | $18.75 | per 1M tokens |
| Cache write (1-hour) | $30.00 | per 1M tokens |
| Blended input + output | $90.00 | 1M in + 1M out at list price |
Pricing References and Billing Caveats
These are the tracked rates, not a live quote. Hosted-provider choice, region, long-context tiers, caching, batch discounts, and temporary promotions can change the actual bill. Open-weight availability does not mean hosted inference is free. Workload examples assume the listed standard input and output rates, with no cache hits or discounts.
Anthropic pricing catalog — check current offerings and rate tiers. This catalog may not list historical models or third-party hosted endpoints.
No model-specific official reference is recorded for this entry. Confirm the current rates directly with your inference provider.
What a Workload Costs
Computed straight from the list prices above — token counts are illustrative workload sizes, not measurements of Opus 4.1.
| Workload | Cost | Tokens |
|---|---|---|
| Short chat turn | $0.052 | 1K in / 500 out |
| Summarize a long document | $1.65 | 100K in / 2K out |
| Agentic coding session | $15.00 | 500K in / 100K out |
| 1M input + 1M output tokens | $90.00 | 1M in / 1M out |
Effective Cost
In AI IQ's scoring, Opus 4.1's list price is adjusted by a token-usage multiplier of 0.581, giving an effective cost of $52.28 per 1M input + output tokens. That places it #154 of 160 models on the effective-cost ranking (lower is cheaper). Some models spend far more tokens than others on the same task, so effective cost compares what a unit of work really costs. Method details are on the methodology page; see all models on the cost charts and the falling cost of intelligence over time.
Cheaper Alternatives at Similar Capability
Models with a lower effective cost that score within a few IQ points of Opus 4.1 (IQ 100), or better.
| Model | Provider | IQ | Effective Cost / 1M |
|---|---|---|---|
| gpt-6.1-sol | OpenAI | 141 | $6.34 |
| opus-5.5 | Anthropic | 140 | $35.97 |
| gpt-6-astra | OpenAI | 139 | $34.62 |
| sonnet-5.5 | Anthropic | 137 | $21.16 |
| gpt-6.1-terra | OpenAI | 136 | $5.08 |
| gpt-6-sol | OpenAI | 136 | $9.87 |